sh: Allow command -pv and command -pV (lookup using _PATH_STDPATH).

svn path=/head/; revision=201343

bin/sh/eval.c

@@ -1023,7 +1023,7 @@ commandcmd(int argc, char **argv)
 	if (cmd != -1) {
 		if (argc != 1)
 			error("wrong number of arguments");
-		return typecmd_impl(2, argv - 1, cmd);
+		return typecmd_impl(2, argv - 1, cmd, path);
 	}
 	if (argc != 0) {
 		old = handler;

bin/sh/exec.c

@@ -720,7 +720,7 @@ unsetfunc(const char *name)
  */
 
 int
-typecmd_impl(int argc, char **argv, int cmd)
+typecmd_impl(int argc, char **argv, int cmd, const char *path)
 {
 	struct cmdentry entry;
 	struct tblentry *cmdp;
@@ -729,6 +729,9 @@ typecmd_impl(int argc, char **argv, int cmd)
 	int i;
 	int error1 = 0;
 
+	if (path != pathval())
+		clearcmdentry(0);
+
 	for (i = 1; i < argc; i++) {
 		/* First look at the keywords */
 		for (pp = parsekwd; *pp; pp++)
@@ -761,17 +764,17 @@ typecmd_impl(int argc, char **argv, int cmd)
 		}
 		else {
 			/* Finally use brute force */
-			find_command(argv[i], &entry, 0, pathval());
+			find_command(argv[i], &entry, 0, path);
 		}
 
 		switch (entry.cmdtype) {
 		case CMDNORMAL: {
 			if (strchr(argv[i], '/') == NULL) {
-				const char *path = pathval();
+				const char *path2 = path;
 				char *name;
 				int j = entry.u.index;
 				do {
-					name = padvance(&path, argv[i]);
+					name = padvance(&path2, argv[i]);
 					stunalloc(name);
 				} while (--j >= 0);
 				if (cmd == TYPECMD_SMALLV)
@@ -821,6 +824,10 @@ typecmd_impl(int argc, char **argv, int cmd)
 			break;
 		}
 	}
+
+	if (path != pathval())
+		clearcmdentry(0);
+
 	return error1;
 }
 
@@ -831,5 +838,5 @@ typecmd_impl(int argc, char **argv, int cmd)
 int
 typecmd(int argc, char **argv)
 {
-	return typecmd_impl(argc, argv, TYPECMD_TYPE);
+	return typecmd_impl(argc, argv, TYPECMD_TYPE, pathval());
 }

bin/sh/exec.h

@@ -71,6 +71,6 @@ void deletefuncs(void);
 void addcmdentry(const char *, struct cmdentry *);
 void defun(const char *, union node *);
 int unsetfunc(const char *);
-int typecmd_impl(int, char **, int);
+int typecmd_impl(int, char **, int, const char *);
 int typecmd(int, char **);
 void clearcmdentry(int);

tools/regression/bin/sh/builtins/command6.0

@@ -0,0 +1,15 @@
+# $FreeBSD$
+PATH=/var/empty
+command -pV ls
+command -pV true
+command -pV /bin/ls
+
+fun() {
+}
+command -pV fun
+command -pV break
+command -pV if
+command -pV {
+
+alias foo=bar
+command -pV foo

tools/regression/bin/sh/builtins/command6.0.stdout

@@ -0,0 +1,8 @@
+ls is /bin/ls
+true is a shell builtin
+/bin/ls is /bin/ls
+fun is a shell function
+break is a special shell builtin
+if is a shell keyword
+{ is a shell keyword
+foo is an alias for bar 

tools/regression/bin/sh/builtins/command7.0

@@ -0,0 +1,29 @@
+# $FreeBSD$
+
+failures=0
+
+check() {
+	if ! eval "[ $* ]"; then
+		echo "Failed: $*"
+		: $((failures += 1))
+	fi
+}
+
+check '"$(PATH=/libexec command -V ld-elf.so.1)" = "ld-elf.so.1 is /libexec/ld-elf.so.1"'
+check '"$(PATH=/libexec command -V ld-elf.so.1; :)" = "ld-elf.so.1 is /libexec/ld-elf.so.1"'
+check '"$(PATH=/libexec command -pv ld-elf.so.1)" = ""'
+check '"$(PATH=/libexec command -pv ld-elf.so.1; :)" = ""'
+
+PATH=/libexec:$PATH
+
+check '"$(command -V ld-elf.so.1)" = "ld-elf.so.1 is /libexec/ld-elf.so.1"'
+check '"$(command -V ld-elf.so.1; :)" = "ld-elf.so.1 is /libexec/ld-elf.so.1"'
+check '"$(command -pv ld-elf.so.1)" = ""'
+check '"$(command -pv ld-elf.so.1; :)" = ""'
+
+PATH=/libexec
+
+check '"$(command -v ls)" = ""'
+check '"$(command -pv ls)" = "/bin/ls"'
+
+exit $((failures > 0))